REVENUES - Summary of Revenue by Source (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Net revenues	$ 72,878	$ 82,972	$ 219,576	$ 239,135
INAP US
Disaggregation of Revenue [Line Items]
Net revenues	56,947	65,678	171,928	186,821
INAP US | Colocation Services
Disaggregation of Revenue [Line Items]
Net revenues	27,334	32,946	82,245	94,747
INAP US | Network services
Disaggregation of Revenue [Line Items]
Net revenues	11,225	13,015	34,381	40,398
INAP US | Cloud Services
Disaggregation of Revenue [Line Items]
Net revenues	18,388	19,717	55,302	51,676
INAP INTL
Disaggregation of Revenue [Line Items]
Net revenues	15,931	17,294	47,648	52,314
INAP INTL | Colocation Services
Disaggregation of Revenue [Line Items]
Net revenues	1,452	1,372	4,344	4,349
INAP INTL | Network services
Disaggregation of Revenue [Line Items]
Net revenues	2,772	2,719	8,224	8,482
INAP INTL | Cloud Services
Disaggregation of Revenue [Line Items]
Net revenues	$ 11,707	$ 13,203	$ 35,080	$ 39,483